Checking the Capacity and Scheduling
Use
For the bucket-oriented capacity check, the system checks if there is sufficient available bucket capacity for the capacity requirements of the operation to be scheduled.A bucket can be one day or a week, for example. If there is enough free capacity in the bucket, the system reserves the required capacity. At the same time, the operation is scheduled infinitely on the time-continuous capacity. Then the system can calculate the availability date of the planned order and calculate a confirmation date.
Prerequisites
You have made the settings for the bucket-oriented capacity check .
Features
Capacity check and scheduling
The check of the capacity requirements of an operation against the available bucket capacity is carried out finitely. At the same time, the system infinitely schedules the operation on the time-continuous capacity.
Planning Operations Beyond Bucket Limits
An operation can be scheduled on two or more adjacent buckets. The capacity in the relevant bucket is reserved proportionally, that is, the net duration of the operation on the bucket times the resource capacity.
If an operation is longer than a bucket or approximately as long as a bucket, it will be harder to plan the operation. Therefore, choose a bucket size that corresponds to the size of the operation. The bucket size should be several time larger than the duration of the average operation.
PP/DS Bucket and PP/DS Horizon
The free capacity of a bucket on which the start time of the PP/DS horizon falls decreases progressively with time. The start of the PP/DS horizon (planned start) is moved to the start of the next bucket.
The end of the PP/DS horizon (planned end) is moved to the bucket end. The entire available capacity of the PP/DS bucket in which the end of the PP/DS horizon lies, is now visible for the bucket-oriented capacity check.
Activities
The system carries out the following planning steps.
First, the system schedules an operation. Starting from the requirements date, the system determines the start date of the operation in a backwards planning direction. The system takes into account all relevant constraints such as the whether an activity can be interrupted or the planning horizon.
The system carries out a capacity check for the PP/DS bucket in which the operation lies. The system checks if there is sufficient capacity available for the operation during this time period.
If there is sufficient capacity available in the bucket, then the system posts the capacity requirement in the bucket, that is, the system reserves the capacity. At the same time, the system infinitely schedules the operation on the time-continuous capacity of the resource.
If the system cannot find sufficient bucket capacity, then the system searches for free capacity in a forwards planning direction.
The system repeats the planning steps until sufficient bucket capacity is found for all the activities of an operation.